Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Internal header file for device mapper | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Sistina Software | |
5 | * Copyright (C) 2004 Red Hat, Inc. All rights reserved. | |
6 | * | |
7 | * This file is released under the LGPL. | |
8 | */ | |
9 | ||
10 | #ifndef DM_INTERNAL_H | |
11 | #define DM_INTERNAL_H | |
12 | ||
13 | #include <linux/fs.h> | |
14 | #include <linux/device-mapper.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/blkdev.h> | |
17 | ||
18 | #define DM_NAME "device-mapper" | |
19 | #define DMWARN(f, x...) printk(KERN_WARNING DM_NAME ": " f "\n" , ## x) | |
20 | #define DMERR(f, x...) printk(KERN_ERR DM_NAME ": " f "\n" , ## x) | |
21 | #define DMINFO(f, x...) printk(KERN_INFO DM_NAME ": " f "\n" , ## x) | |
22 | ||
23 | #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ | |
24 | 0 : scnprintf(result + sz, maxlen - sz, x)) | |
25 | ||
1da177e4 LT |
26 | #define SECTOR_SHIFT 9 |
27 | ||
28 | /* | |
29 | * List of devices that a metadevice uses and should open/close. | |
30 | */ | |
31 | struct dm_dev { | |
32 | struct list_head list; | |
33 | ||
34 | atomic_t count; | |
35 | int mode; | |
36 | struct block_device *bdev; | |
37 | char name[16]; | |
38 | }; | |
39 | ||
40 | struct dm_table; | |
41 | struct mapped_device; | |
42 | ||
43 | /*----------------------------------------------------------------- | |
44 | * Functions for manipulating a struct mapped_device. | |
45 | * Drop the reference with dm_put when you finish with the object. | |
46 | *---------------------------------------------------------------*/ | |
47 | int dm_create(struct mapped_device **md); | |
48 | int dm_create_with_minor(unsigned int minor, struct mapped_device **md); | |
49 | void dm_set_mdptr(struct mapped_device *md, void *ptr); | |
9ade92a9 | 50 | void *dm_get_mdptr(struct mapped_device *md); |
d229a958 | 51 | struct mapped_device *dm_get_md(dev_t dev); |
1da177e4 LT |
52 | |
53 | /* | |
54 | * Reference counting for md. | |
55 | */ | |
56 | void dm_get(struct mapped_device *md); | |
57 | void dm_put(struct mapped_device *md); | |
58 | ||
59 | /* | |
60 | * A device can still be used while suspended, but I/O is deferred. | |
61 | */ | |
aa8d7c2f | 62 | int dm_suspend(struct mapped_device *md, int with_lockfs); |
1da177e4 LT |
63 | int dm_resume(struct mapped_device *md); |
64 | ||
65 | /* | |
66 | * The device must be suspended before calling this method. | |
67 | */ | |
68 | int dm_swap_table(struct mapped_device *md, struct dm_table *t); | |
69 | ||
70 | /* | |
71 | * Drop a reference on the table when you've finished with the | |
72 | * result. | |
73 | */ | |
74 | struct dm_table *dm_get_table(struct mapped_device *md); | |
75 | ||
76 | /* | |
77 | * Event functions. | |
78 | */ | |
79 | uint32_t dm_get_event_nr(struct mapped_device *md); | |
80 | int dm_wait_event(struct mapped_device *md, int event_nr); | |
81 | ||
82 | /* | |
83 | * Info functions. | |
84 | */ | |
85 | struct gendisk *dm_disk(struct mapped_device *md); | |
86 | int dm_suspended(struct mapped_device *md); | |
87 | ||
88 | /*----------------------------------------------------------------- | |
89 | * Functions for manipulating a table. Tables are also reference | |
90 | * counted. | |
91 | *---------------------------------------------------------------*/ | |
1134e5ae MA |
92 | int dm_table_create(struct dm_table **result, int mode, |
93 | unsigned num_targets, struct mapped_device *md); | |
1da177e4 LT |
94 | |
95 | void dm_table_get(struct dm_table *t); | |
96 | void dm_table_put(struct dm_table *t); | |
97 | ||
98 | int dm_table_add_target(struct dm_table *t, const char *type, | |
99 | sector_t start, sector_t len, char *params); | |
100 | int dm_table_complete(struct dm_table *t); | |
101 | void dm_table_event_callback(struct dm_table *t, | |
102 | void (*fn)(void *), void *context); | |
103 | void dm_table_event(struct dm_table *t); | |
104 | sector_t dm_table_get_size(struct dm_table *t); | |
105 | struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); | |
106 | struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); | |
107 | void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q); | |
108 | unsigned int dm_table_get_num_targets(struct dm_table *t); | |
109 | struct list_head *dm_table_get_devices(struct dm_table *t); | |
110 | int dm_table_get_mode(struct dm_table *t); | |
1134e5ae | 111 | struct mapped_device *dm_table_get_md(struct dm_table *t); |
1da177e4 LT |
112 | void dm_table_presuspend_targets(struct dm_table *t); |
113 | void dm_table_postsuspend_targets(struct dm_table *t); | |
114 | void dm_table_resume_targets(struct dm_table *t); | |
115 | int dm_table_any_congested(struct dm_table *t, int bdi_bits); | |
116 | void dm_table_unplug_all(struct dm_table *t); | |
117 | int dm_table_flush_all(struct dm_table *t); | |
118 | ||
119 | /*----------------------------------------------------------------- | |
120 | * A registry of target types. | |
121 | *---------------------------------------------------------------*/ | |
122 | int dm_target_init(void); | |
123 | void dm_target_exit(void); | |
124 | struct target_type *dm_get_target_type(const char *name); | |
125 | void dm_put_target_type(struct target_type *t); | |
126 | int dm_target_iterate(void (*iter_func)(struct target_type *tt, | |
127 | void *param), void *param); | |
128 | ||
129 | ||
130 | /*----------------------------------------------------------------- | |
131 | * Useful inlines. | |
132 | *---------------------------------------------------------------*/ | |
133 | static inline int array_too_big(unsigned long fixed, unsigned long obj, | |
134 | unsigned long num) | |
135 | { | |
136 | return (num > (ULONG_MAX - fixed) / obj); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Ceiling(n / sz) | |
141 | */ | |
142 | #define dm_div_up(n, sz) (((n) + (sz) - 1) / (sz)) | |
143 | ||
144 | #define dm_sector_div_up(n, sz) ( \ | |
145 | { \ | |
146 | sector_t _r = ((n) + (sz) - 1); \ | |
147 | sector_div(_r, (sz)); \ | |
148 | _r; \ | |
149 | } \ | |
150 | ) | |
151 | ||
152 | /* | |
153 | * ceiling(n / size) * size | |
154 | */ | |
155 | #define dm_round_up(n, sz) (dm_div_up((n), (sz)) * (sz)) | |
156 | ||
157 | static inline sector_t to_sector(unsigned long n) | |
158 | { | |
159 | return (n >> 9); | |
160 | } | |
161 | ||
162 | static inline unsigned long to_bytes(sector_t n) | |
163 | { | |
164 | return (n << 9); | |
165 | } | |
166 | ||
167 | int dm_split_args(int *argc, char ***argvp, char *input); | |
168 | ||
169 | /* | |
170 | * The device-mapper can be driven through one of two interfaces; | |
171 | * ioctl or filesystem, depending which patch you have applied. | |
172 | */ | |
173 | int dm_interface_init(void); | |
174 | void dm_interface_exit(void); | |
175 | ||
176 | /* | |
177 | * Targets for linear and striped mappings | |
178 | */ | |
179 | int dm_linear_init(void); | |
180 | void dm_linear_exit(void); | |
181 | ||
182 | int dm_stripe_init(void); | |
183 | void dm_stripe_exit(void); | |
184 | ||
185 | void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size); | |
186 | union map_info *dm_get_mapinfo(struct bio *bio); | |
187 | ||
188 | #endif |